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The females of Pitymys subterraneus bred in laboratory conditions have an irregular sexual cycle and induced ovulation. The first freshly ovulated eggs, surrounded by dense cumulus cells, appear in oviducts 10 h after copulation. Administering exogenous gonadotropins: pregnant mare's serum (PMS), human chorionic gonadotropin (hCG) or luteinizing hormone releasing hormone (LHRH), also induces ovulation in mature females of Pitymys subterraneus. In these experimental conditions females ovulate a similar number of eggs as after copulation. Dual stimulation (PMS and hCG plus copulation) does not result in the ovulation of a large number of normal ova, however, it does cause a release of degenerated oocytes.

Ovulation and Fertilization in the Vole, Pitymys subterraneus